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MAX5902 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5902 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page +72V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers _______________________________________________________________________________________ 7 A thermal shutdown feature protects the external MOS- FET by turning it off if the die temperature of the MAX5902/MAX5903 exceeds +125°C. The MAX5902/ MAX5903 must be in good thermal contact with the external MOSFET. See Layout Guidelines in the Appli- cations section of the data sheet. A circuit-breaker function monitors the voltage across the external MOSFET, VSD, and turns off the MOSFET if VSD exceeds the circuit-breaker threshold, VCB. The circuit-breaker function is enabled after the MOSFET is fully enhanced. Three threshold voltage options are available—300mV, 400mV, and 500mV. One version is available with no circuit-breaker function. Fault man- agement for the MAX5902/MAX5903 is offered with two different configurations; latched and automatic retry. Latched Circuit Breaker After a circuit-breaker trip event, the latched versions (MAX5902L/MAX5903L) drive GATE to VS, turning off the external MOSFET, and PGOOD (PGOOD) is deasserted. A latched off condition needs to be reset by toggling ON/OFF low for at least 10ms, or by cycling the power supply, VS. Automatic Retry Circuit Breaker After a circuit-breaker trip event, the automatic retry versions (MAX5902A/MAX5903A) drive GATE to VS, turning off the external MOSFET, and PGOOD (PGOOD) is deasserted. If the start conditions are met for a full 150ms (tRS) the start sequence is re-initiated. The start conditions are: the device is not in UVLO; ON/OFF is not driven low; and the device is not in ther- mal shutdown. No Circuit Breaker For the versions without a circuit breaker, MAX5902N (MAX5903N), PGOOD (PGOOD) are asserted when the MOSFET is fully enhanced. Once powered up the MAX5902N/MAX5903N ignore the MOSFET drain-to- source voltage for applications where a circuit-breaker function is not desired. Applications Information ON/ OFF Control Input The ON/OFF control input provides three functions: external ON/OFF control; setting of the UVLO level; and resetting after a circuit-breaker event has caused the MAX5902L/MAX5903L to turn off the external MOSFET. Pulling ON/OFF to GND for at least 10ms (tOFF) forces the MAX5902/MAX5903 to turn off the external MOSFET (see Figure 3 for a circuit example). To reset the MAX5902L/MAX5903L after a circuit-breaker event, toggle ON/OFF to GND for at least 10ms (tOFF). ON/OFF can be used to sequence power supplies. Connecting a capacitor from ON/OFF to GND will delay the rise of ON/OFF proportional to the capacitance and input impedance of ON/OFF, typically 33kΩ (Figure 4). The MAX5902/MAX5903 can be controlled by logic- level signals. Logic-level signals of 3.3V or 1.8V may be directly connected to ON/OFF. For 5V logic level control, insert a series 47kΩ resistor as shown in Figure 5. Figure 4. Power-Supply Sequencing HOT-SWAP CONTROLLER #1 VS GND C 2C MAX5902 MAX5903 VS ON/OFF HOT-SWAP CONTROLLER #2 GND VS GND MAX5902 MAX5903 ON/OFF HOT-SWAP CONTROLLER OPTIONAL +24V VS GND R2 40.2kΩ R1 3.01kΩ MAX5902 MAX5903 GND DGND ON/OFF ON/OFF Figure 3. Programmed +18V Lockout, with Optional Optocoupler On/Off Control. |
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